Malcolm, Andrew. "A New High for Disco in Toronto's Tower." The New York Times. (10, October, 1979): C18.

"Toronto, for three years this city has laid claim to the highest freestanding structure in the world, an 1,815 foot concrete spike looming so far above downtown that the too often disappears in the clouds."

The height of the tallest building has been increasing over the years. As more
buildings are proposed to be construct, even fact books cannot keep track of which
to name the tallest building.

Many people consider "buildings" as structures that are habitable.
Since 1974, the commercial Sears Tower in Chicago, United States, was named the
tallest building with the height of 443 meters, without antennas. However, in
1998, the Petronas towers in Kuala Lumpur, Malaysia, became the world's tallest
office building. Both of the Petronas Towers stand 452 meters tall, including
top poles. Even though the Sears Towers, without antennas, is taller than the
Petronas Towers, without poles, experts include the poles in measurement and not
Sear's antennas because the poles are considered an important architectural design
to the towers. This makes the Petronas Towers the tallest buildings in the world.

Various buildings have been proposed to succeed this height. In the fall of
1999, the plans to build The Shanghai World Financial Center was announced. The
building will be 463 meters tall. In Chicago, United States, city officials have
approved plans to build 7 South Dearborn, housing offices and condos. The building
will soar to 472 meters in height. A spiritual master in India plan to create
the Maharishi Tower of World Peace. This pyramidal tower will contain offices,
hotels, apartments and shops. The proposed height is 488 meters. Also expected
is the Kowloon MTR Tower in Hong Kong, China. The 102-story building will reach
the height of 549.5 meters. Yet, only up to 550 meters of the tower will actually
be habitable.

On the other hand, it is debatable to consider freestanding towers, inhabitable,
as "buildings". The famous CN tower is often stated as the tallest building
in the world. Located in Toronto, Canada, completed in 1976, the tower stands
at 553 meters (including antennas). But, the proposed Indosat Telkom Tower, a
telecommunication skyscraper being built in Jakarta, Indonesia will be the tallest
freestanding tower with the height of 558 meters, once it is completed

The topic of the highest building in the world is one of great controversy.
One of the main debates is about the standards considered when measuring the heights
of these immense buildings. In 1997, the Council on Tall Buildings and Urban Habitats
decided on four factors in judging building height; the height to the structural
top, to the highest floor, to the top of the roof, and finally the height to the
top of an antenna. The Petronas Twin Towers of Kuala Lampur, Malaysia is generally
accepted as the world's tallest building. The towers rise to an incredible 451.9 m
and wins in the structural top category.

Structural height means the elevation from the base of the building to its
architectural top, which includes decorative structures but not antennas. Because
the towers have spires on top, they are able to win in the category. However,
if antennas had also been accounted for, the Sears tower in Chicago would win
with a height of 526 M. Since the Sears tower also has the highest
occupied floor height and the highest roof, many people believe this must be the
highest building in the world.

However, some people disagree with both of these arguments. For example, many
Canadians feel that their 553 m CN Tower is the tallest building in the world.
This raises the question of the definition of a building, which has been traditionally
accepted as a closed structure made for occupancy. This implies that the CN tower
and many other enormous structures such as TV/ oil towers are excluded from the
competition. As the controversy continues, architects and engineers also continue
in the race to build even higher.

The graph above was produced by using skyscraper.com's
top 100 tallest buildings of the world according to structural height. The
graph shows the building heights versus the ranking given each building from 1
to 100. The data points best fit is a power curve y = A*x^B, with the
power B being -0.162. The graph makes it clear to acknowledge that the height
difference between the buildings with the highest ranks are much greater compared
to those building with lower ranks. The world's tallest buildings if placed side
by side would physically form the shape of this power curve. Also, from the density
of the points on the graph, it can be seen that there are fewer numbers of buildings
in the top ranks. The lower ranks show clustered points indicating that there
are many of these buildings which share similar heights.

"Taipei 101 will hold 3 of the World's Tallest Building titles when it is topped out: Tallest to structural top, Tallest to roof and Highest occupied floor …. Taipei 101 now holds the title of the world's tallest building measured to the roof, replacing the Sears Tower."